\begin{equation}
	\ell_{j}(x): = \prod_{0 \leq m \leq k; \quad m \neq j}\frac{x - x_m}{x_j - x_m} = \frac {x - x_0}{x_j - x_0}\cdots \frac {x - x_{j - 1}}{x_j - x_{j - 1}}\frac {x - x_{j + 1}}{x_j - x_{j + 1}}\cdots \frac {x - x_k}{x_j - x_k}
\end{equation}

\begin{equation}
	W = 
	\begin{bmatrix}
		1    & 0   & 0 & 0 & 0 & 0 \\
		0    & 1   & 0 & 0 & 0 & 0 \\
		0    & 0   & 1 & 0 & 0 & 0 \\
		0    & z_i & 0 & 1 & 0 & 0 \\
		-z_i & 0   & 0 & 0 & 1 & 0 \\
		0    & 0   & 0 & 0 & 0 & 1
	\end{bmatrix}
\end{equation}

\begin{itemize*}
	\item dünne Platten, kleine Verformungen
	\item dünne Platten, große Verformungen
	\item dicke Platten
\end{itemize*}
